title: Autosomal recessive retinitis pigmentosa and cone-rod dystrophy caused by splice site mutations in the Stargardt's disease gene ABCR.
abstract: Ophthalmological and molecular genetic studies were performed in a consanguineous family with individuals showing either retinitis pigmentosa (RP) or cone-rod dystrophy (CRD). Assuming pseudodominant (recessive) inheritance of allelic defects, linkage analysis positioned the causal gene at 1p21-p13 (lod score 4.22), a genomic segment known to harbor the ABCR gene involved in Stargardt's disease (STGD) and age-related macular degeneration (AMD). We completed the exon-intron structure of the ABCR gene and detected a severe homozygous 5[prime] splice site mutation, IVS30+1G->T, in the four RP patients. The five CRD patients in this family are compound heterozygotes for the IVS30+1G->T mutation and a 5[prime] splice site mutation in intron 40 (IVS40+5G->A). Both splice site mutations were found heterozygously in two unrelated STGD patients, but not in 100 control individuals. In these patients the second mutation was either a missense mutation or unknown. Since thus far no STGD patients have been reported to carry two ABCR null alleles and taking into account that the RP phenotype is more severe than the STGD phenotype, we hypothesize that the intron 30 splice site mutation represents a true null allele. Since the intron 30 mutation is found heterozygously in the CRD patients, the IVS40+5G->A mutation probably renders the exon 40 5[prime] splice site partially functional. These results show that mutations in the ABCR gene not only result in STGD and AMD, but can also cause autosomal recessive RP and CRD. Since the heterozygote frequency for ABCR mutations is estimated at 0.02, mutations in ABCR might be an important cause of autosomal recessive and sporadic forms of RP and CRD.
authors.affiliation: Department of Human Genetics, University Hospital Nijmegen, PO Box 9101, 6500 HB Nijmegen, The Netherlands. f.cremers@antrg.azn.nl
authors.forename: F P
authors.initials: FP
authors.lastname: Cremers
authors.forename: D J
authors.initials: DJ
authors.lastname: van de Pol
authors.forename: M
authors.initials: M
authors.lastname: van Driel
authors.forename: A I
authors.initials: AI
authors.lastname: den Hollander
authors.forename: F J
authors.initials: FJ
authors.lastname: van Haren
authors.forename: N V
authors.initials: NV
authors.lastname: Knoers
authors.forename: N
authors.initials: N
authors.lastname: Tijmes
authors.forename: A A
authors.initials: AA
authors.lastname: Bergen
authors.forename: K
authors.initials: K
authors.lastname: Rohrschneider
authors.forename: A
authors.initials: A
authors.lastname: Blankenagel
authors.forename: A J
authors.initials: AJ
authors.lastname: Pinckers
authors.forename: A F
authors.initials: AF
authors.lastname: Deutman
authors.forename: C B
authors.initials: CB
authors.lastname: Hoyng
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000235:genetics*; D000483:Alleles; D017398:Alternative Splicing; D001483:Base Sequence; D002874:Chromosome Mapping; D002878:Chromosomes, Human, Pair 1; D005091:Exons; D005260:Female; D005451:Fluorescein Angiography; D005808:Genes, Recessive; D006580:Genetic Carrier Screening; D006801:Humans; D007438:Introns; D008126:Lod Score; D008268:Macular Degeneration / Q000235:genetics*; D008297:Male; D010375:Pedigree; D017354:Point Mutation; D012174:Retinitis Pigmentosa / Q000235:genetics* / Q000473:pathology
chemical_list: C056475:ABCA4 protein, human; D018528:ATP-Binding Cassette Transporters